Pictures: Younger than Facebook

Foundation date: March 21, 2006 People were poking and liking status updates more than two years before retweeting and following others on Twitter. Like Facebook, Twitter saw a spike in popularity a year after launch, with usage increasing from 20,000 tweets per day to 60,000. The site now has over 600 million users and an average of around 60 million tweets per day.

Foundation date: March 21, 2006 People were poking and liking status updates more than two years before retweeting and following others on Twitter. Like Facebook, Twitter saw a spike in popularity a year after launch, with usage increasing from 20,000 tweets per day to 60,000. The site now has over 600 million users and an average of around 60 million tweets per day. (Twitter.com)